US5043222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal sealing glass composite with matched coefficients of thermal expansion
Assignee: Olin Corp
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Filing: 1990-04-23
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Granted: 1991-08-27
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Expires: 2010-04-23
Abstract
Abstract The present invention relates to a glass for making glass to metal seals. The coefficient of thermal expansion of the glass is in excess of 160x10-7 in/in/ DEG C. making the glass particularly useful for sealing copper and copper based alloys. The glass has particular utility in the manufacture of electronic packages and multi-layer circuitry.
Inventors
- 👤 Satyam C. Cherukuri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:38
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/24; H; H10; H10W; H10W76/00; H10W76/60; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/682; H10W70/685; H10W90/00; H10W90/701; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
182 words
A metal-glass composite, comprising: a first metal or metal alloy component; a glass sealable layer on at least one surface of said metal or metal alloy; and a sealing glass component bonded to said metal or metal alloy component by means of said sealable layer, said glass sealing component consisting essentially of at least 50 molar percent SiO 2 , from about 12 to about 15 molar percent BaO such that said sealing glass component has a coefficient of thermal expansion of from about 165×10 -7 in/in/° C. to about 175×10 -7 in/in/° C., from about twenty to about thirty molar percent of an alkaline oxide component, said alkaline oxide component comprised of at least two alkaline oxides selected from the group consisting of Na 2 O, K 2 O and Li 2 O; from about 0.5 molar percent to about five molar percent Al 2 O 3 ; and up to about 10 molar percent of an additive selected from the group consisting of B 2 O 32 P 2 O 5 , MgO, CaO, GeO2, SrO, PbO and mixtures thereof.
Claim 2
Dependent Claim
182 words
A metal-glass composite, comprising: a first metal or metal alloy component; a glass sealable layer on at least one surface of said metal or metal alloy; and a sealing glass component bonded to said metal or metal alloy component by means of said sealable layer, said glass sealing component consisting essentially of at least 50 molar percent SiO 2 , from about 12 to about 15 molar percent BaO such that said sealing glass component has a coefficient of thermal expansion of from about 165×10 -7 in/in/° C. to about 175×10 -7 in/in/° C., from about twenty to about thirty molar percent of an alkaline oxide component, said alkaline oxide component comprised of at least two alkaline oxides selected from the group consisting of Na 2 O, K 2 O and Li 2 O; from about 0.5 molar percent to about five molar percent Al 2 O 3 ; and up to about 10 molar percent of an additive selected from the group consisting of B 2 O 32 P 2 O 5 , MgO, CaO, GeO2, SrO, PbO and mixtures thereof.
Claim 3
Dependent Claim
15 words
The composite of claim 1 wherein said substrate is copper or a copper based alloy.
Claim 4
Dependent Claim
30 words
The composite of claim 2 wherein the concentration of SiO 2 within said glass component is in the range of from about fifty-five molar percent to about sixty-five molar percent.
Claim 5
Dependent Claim
27 words
The composite of claim 3 wherein the concentration of SiO 2 within said glass component is from about fifty eight molar percent to about sixty molar percent.
Claim 6
Dependent Claim
37 words
The composite of claim 4 wherein the concentration of BaO in said glass component is selected so that said glass has a coefficient of thermal expansion approximately equal to that of said first metal or metal alloy.
Claim 7
Dependent Claim
19 words
The composite of claim 5 wherein said at least two alkaline oxides are present in essentially equal molar concentrations.
Claim 8
Dependent Claim
24 words
The composite of claim 6 wherein said alkaline oxide component consists of essentially equal molar concentrations of Na 2 O and Li 2 O.
Claim 9
Dependent Claim
31 words
The composite of claim 1 wherein said concentration of Al 2 O 3 in said glass is in the range of from about 0.5 molar percent to about 3 molar percent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |